Expired Canadian patentCanada
Tyre tread compound
CA 2043776 C · Owner: Chanse, Andrew · Inventors: Chanse, Andrew; Stephens, Paul
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tire tread compound, particularly useful for truck tires, comprises a base polymer of natural or synthetic rubber, a filler at least 50% of which is carbon black and between 2 and 10 parts of epoxy resin per hundred parts of polymer.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 11, 1991 and granted December 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 11, 1991
GrantedDecember 24, 2002
Term endedJune 11, 2011
Patent numberCA 2043776 C
Classification (IPC)C08L7/00 +2 more
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.